diff --git a/aeat_mapping.py b/aeat_mapping.py
index 0d047ed..ef4a053 100644
--- a/aeat_mapping.py
+++ b/aeat_mapping.py
@@ -79,7 +79,10 @@ class BaseTrytonInvoiceMapper(Model):
         if invoice.description:
             return tools.unaccent(invoice.description)
         if invoice.lines and invoice.lines[0].description:
-            return tools.unaccent(invoice.lines[0].description)
+            value = tools.unaccent(
+                invoice.lines[0].description.replace('\n', ''))
+            if value:
+                return value
         return self.serial_number(invoice)
 
     def counterpart_country(self, invoice):